Artificial ear for telephonometric measurements

Details Artificial ear for telephonometric measurements Artificial ear for telephonometric measurements

1978-03-08

1979-05-01

Robinson, Thomas A.

H04R 2900

Patent

active

041525558

ABSTRACT:
A device to be used in phonometric measurements on telephone equipment, simulating a human ear, has a generally disk-shaped body with an annular ridge encompassing a frustoconical central recess serving as a wide-open entrance cavity. The body has several internal cavities communicating with the recess through restricted channels, namely a pair of major cavities resonant at low audio frequencies, an intermediate cavity resonant in the middle audio range, and a minor cavity resonant at high audio frequencies, the last-mentioned cavity having the shape of a narrow cylinder extending generally along the body axis. A microphone, connected to a measuring circuit, rises from the bottom of the recess to substantially the top level of the surrounding ridge to pick up incoming sounds at that level.

REFERENCES:
patent: 3744294 (1973-07-01), Lewis et al.
Green Book, vol. V, Recommendation p. 51, ". . . Artifical Ear . . . ", recommedation by CCITT of the IEC.
Funk-Technik, 32, Jahrgang, Nr. 5/1977, "A New Coupling Device for Headphone . . . Measurement".

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